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A rectangular lawn of dimensions 80 m * 60 m has two roads each 10 m wide running in the middle of the lawn, one parallel to the length and the other parallel to the breadth. What is the cost of traveling the two roads at Rs.3 per sq m?

Correct answer: D. Rs.3900

  • A. Rs.3600
  • B. Rs.3700
  • C. Rs.3800
  • D. Rs.3900

Explanation

The road parallel to the length covers 80 m x 10 m = 800 m², and the road parallel to the breadth covers 60 m x 10 m = 600 m². Their 10 m x 10 m intersection is counted twice, so total road area = 800 m² + 600 m² - 100 m² = 1300 m². Cost = 1300 m² x Rs.3 per m² = Rs.3900, so option d is correct; option a ignores part of one road.

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